12. Jonah Hill

Not all of the changes from 2017 are associated with hairstyles. American actor and screenwriter Jonah Hill also made an amazing transformation of his body: he stopped drinking alcohol and eating fast food, sweets, and soda. He took up sports, and the results are really impressive.

8. Selena Gomez

Girls know that changes in their private life can be highlighted with a new hairstyle. In 2017, Selena shocked her fans twice: first, she changed her haircut, and then she started dating Justin Bieber again and dyed her hair blonde.

5. Bella Thorne

Bright young star Bella Thorne has been adding colors to her life all year long. She changed her hair color and brought lots of joy to her Instagram followers. The Disney princess was a mermaid, a blue-haired lady...and such bright colors suit her.

2. Emilia Clarke

1. Katy Perry

Katy Perry used to have light brown hair before her music career. When she decided to conquer the world of music, she became a burning brunette. In 2017, the singer cut her hair and chose the light side again. But this tone is a bit lighter than the one she had in her childhood.